Davit



April s 11526.

DAv'Ir Filed Feb., 1s; .1922

-to prevent-accidental,springinggjor bending Patented pnilr, V192,6.

l f` g 15795455 ANE PIETER so'HAnoE THEHAGE; NETHERLANDS.

. j Y Appiicationaieiirebniary1s, 1922. lseriainasazesa.

To @ZZ/whom i 72mg/ concern:

f itknown that LANE P. Soriana citi- Zen the Netherlands, residing at The fia'gue, inthe Province of Zuid,vand Kinglein. of1 the Netherlands, have invented ceri ia n new and useful Improvements in Davi ts,

of which the following is aspecification-` invention relates'to davits for raising and lowering lifeboats,Y particularly boats for liaiboruse, wl-iich haveto be swung in and out so frequently-that it is very desirable to have the fdavits*provided with means for easily'aiid quickly returning the boats inboard without the necessity of'having to rig upgtaclde. for that purpose.

- My object is to `provide a'dayit of this character:adapted tobe swung 'in and Vout by means of a thrust screw housed ina protecting tube, with theV parts so arranged that slight springing or bending of the tube, froni accident or otherwise,- ivill notl affect the operation of the screw.

Yirnother Objectis Vto p'rovidcnieans`for shielding the protecting tube against 'blows /orsudden strains of any kind that might permanently spring o r bend it; 'to a' degree that wouldhindcr the operation 'of the screw y or possibly render ,it inoperatii'f'e.

1A further object is to provide device of the character described, with the parts so constructed and arranged that the vjibr of, the vdavit can be given ainple overhang without imparting torsional strain to thefthrust screw mechanism when thefdavit is heavily loaded.

. lA stillfurther lobject isfto' provide a davitV which may be inade'eitlierl automatic ornonautomatic, atA the will of the opera-tor, in so,l 1 far as its inboard and outboard movement is concerned. v

IOther objects will appear in the subjoiiied description. l ,i AnV important feature of the invention consists in the thrust" screw rarrangement which not only has the usual universali oiiit..

at onefendthereof, butis also pro'vidcdwith `a universal joint inside the .telescoginghparts of the outertube from ui'ifavorably affecting l, the easy and 'perfect op'eiation''of the screw;

whileV another feature is the light and simple arrangement for yshielding the telescoping :parts against accidental springing or bending; thus insuringthe perfect operation of this vitalfpart of the operating mechanism.

f. ,A l n'AV'IT.

f'lheinvention consists iiijcertain novel `features of construction and arrangementof parts,` as will be hereinafter 1 describedand claiii'iedv reference being had tojthe accompanying drawings in kwhich'g# Fig. 1 is arfsideelevation of my improved davit, with vthe protecting arrangement for p the thrustl screw omitted lfor clearness.

Fig. 2 is an elevatioii'showing tliefo'uter end of Fig. l.: l Fig.v 3. is aside View of the telescoping screw arrangement, .on a somewhat"enlarged scale, with parts ofthe protecting arrangement shown in section; y ,f 'I Y g Fig. L .is aY sectional view-of tli'eftelescop'iiig tube! Vwith the protecting arrangement omitted. o 1 Yif' Fig. 5 is a sectional `View on anfenliirgjed scale of the lpivotedvdavit socket gA and,

Fig. 6 is va plan .viewof one of the circular plates forn'iing a, part ofA thc protecting arrangen'ient of the thrust screw. y v The nui'neral 1 indicates the decl; of aV ship, and 2, afsupporting plate mounted Vthere-l oii. QRgdly secured to the outer yend ofthe plate ,2 is the velongated vsocket lsupport 3,

havingvthe iipturned endsv 3 provided with -two kparallel sections securely held lto 1;ether a boltjptvith the-*inner loneofy said sections ,diverging' belowsaid bolt' to form the brace portion 7 of tlicvstandaid, the two ends ofthe standard being bent *in opposite directionsfat-"theirf lower lends yto formthe spacedfeet portions .5a.l and 7 a respective1y vof the'staiidard, ,whereby to strongly vbrace the A"standard against hthe* 'st-rain imposed thereupon bygtlie'loaded davit..' Y. The davit socket 8 i's'provided at its lower vend "with atransverse portion 9 connected by integralvwebs" 10 withthe 4body of the socket, terminating at "its ends in downwardly extending ears 1-1 spaced ample distance 10ol i' Afrom eachother and adapted-'toy vbereceived' vbetween the ears Baof the support 3, andhaving alined bores y12 to correspond. with the 'aline'd'bores 4 of-said last namedears, whereby the socket 8'is rotatably mounted on the -support 3 by means lof the lpiiior: bafrfl which passes throughlall of said alined bores. y Thesocket 8 is provided at'itstop with an annular outwardly extending flange 14C having one or more small bores 15 therein. A cap 16 having' an integral collar 17 adapted to be rigidly secured to the davit, is mounted on top of the socket 8, with its downwardly extending annular lip 18 lit ting around the outer peripheral edge of the flange 14 to prevent water and dirt from entering the socket, and to hold the -davit against rocking laterally in the socket even though it be loosely mounted therein. rThe cap 16 has one or more bores 19 adapted to corneinto registration with the bores 15 of the socket, so that a pin 2O may be passed down through two of these registering bores to lock the cap 16 against rotation onthe socket when desired.

A handle 21 is rigidly secured to the collar 17 of the cap 16 for purposes more specilica-lly referred to hereafter.

Attention is now called to the thrust screw arrangement by which the socket 8 and the davit 22 carried thereby are rocked back and forth. Said arrangement consist-s of a tube 23 with a cap 24 screwed onto the outer end thereof, with a ball 25 received inside the cap between the bottom thereof and the inner end of the tube 23, the ball 25 being provided with a central threadedopening adapted to rec-eive the threaded screw rod 26, the tube 23 and the head of the cap 24 having an opening 27 considerably larger than the screw rod 26; the screw rod having a head 28 shrunk on its outer end, said head being provided with a conical inner face729-which r cooperates with a correspondingly beveled bore in the head of the cap 24; said head 28 of the screw rod being connected through the universaly joint 30 (see Fig.V 1) with the ope-rating crank 31 on the short shaft 32 suitably mounted in the upper end of the standard 5f A smallpin 33 secured inthe ball 25 and extending out through the openingl 34 in theunder side ofthe cap 24, prevents the ball fromv rotating with the screw rod 26, the opening being large enough to permit ample clearance aroundI the pin 33.

A small inverted 'capor stopper 35l closes the outer end of the opening 27 of the tubo 23 to exclude salt air and salt water.

The tube .J3 is bifurcatedi at its inner end to form the pair of parallel ears 36 sufiicicntlyspaced apart to receive between them'the integral f lug 37 atA the 4upper end of the socket8, said ears and lug being pivotally connected together. y

From the foregoing it willv be seen that we have a universal joint connection 43() outside the telescoping-parts and: another universal joint 25 inside the teleseopingr parts.

Fig. 3 illustrates asimple-method of bracing the tube 23 against bending. Circular plates -38 and 39- having ample collars. are shrunk onto said tube 23 so as to be very rigidly secured thereto. A third plate 40 is snugly received on the outer end of the cap 24 as shown, and is held in position thereon by the rods 41v which extend through all three of the plates and` are provided on their ends with threaded' nuts 42 for adjusting purposes. The rods 41 are provided with rigid stops 42a for engagement with the outer face of the plate 39; and the plate 40 andA the portion of the rods extending therefrom to the stops 42n may be omitted whenever desired; or there may be one set of rods connecting the plate 39 with the plate 38, and another set connecting said plate 39 with the plate 40 wheneveritA is desired to have the protecting rodsextend over the cap 24, in which case the plate39 is provided with eight bores 43 as^shown in Fig. 6, instead of only four as in the plates 38 -and 40.

The operation of my device is as follow i The davit 22 is rotatably mounted; in the socket- 8 with the cap 16 rigidly secured to the davit by any ordinary or preferred means, as for instance, by the key 44 (see Fig. 1). The overhanging peripheral flange 18 of the cap 16 engages the outer periphery of the flange 14 at the upper endy of the socket, snugly fitting the same,l and-.thereby forms a bearing adapted tof receive the heavy lateral strain imposed upon the davit when swinging out a heavy load, thus holdiing the davit against lateral play in the socket and preventing the grinding vof the davit against the inner walls of the socket at the upper end thereof.

The davit is roel-:ed in and out by means of the thrust screw arrangement which is operated by the crank 31. Y

Since the davit is rotatable in the socket 8, the thrust screw arrangement is relieved of all torsional strain such as wouldA otherwise be imposed thereupon if the davit `were rigidly mounted in the socket; andthe jib of the davit may therefore be made toA eX- tend over farther than would otherwise be practicable, so as to engage the lifeboats farther in from their ends, since lifeboats when heavily loaded are much more liable to become sprung and distorted whenv sup# ported near their ends than if supported farther in toward the centre of the boats.

)Viren the davit is rocked inwardly past its vertical position (indicated by thedotted line a in Fig. 1) it will` havel a` tendency to automatically rotate'inb-oard and to remain inboard; whereas, when itl is rocked outwardly past said vertical linea, it will have' a tendency to rotate outboard,` and thus accelerate the outward movement ofa boat. ll'hen the davit is moved out past the vertical line a to a `point where it just begins to move 'out automatically', the operator' may take hold of the handle21 and' directly operate the davit thereby, thus providing aux'- iliary means :toria very pucky and direct manual movement of theY davit. to its inboard and outboard positions, only leaving the remainder oftheoperation to be performed by the operation Aofthe thrust screw.

Then desired, the davit may V,belocked against rotation'in the "socket by 'means-'ot'.

" the lateral strain imposed thereupon by the greater than ordinary inward extentv of the jibof vthe' davit, to preventjany twisting or vtorsional strain upon the'thrus't screw mechanism. However, inl casesuch strain -is nnparted to said mechanism so that kthe tube 23 is bent. thereby, lor in case said tube should accidentally become permanently 'bent somewhat from other cause, the fact vthat the screw rod has an internal universal "oint and'has lateral ala in the tube 23, l l y will prevent said screvx7 rod 'from binding in said tube, so that despite the bend in the tube, the thrust screw arrangement will still wor; perfectly. 1 j f To further insure the perfect .working-of the thrust screw arrangement at all times, it is provided Awith'the protecting arrangement shown in Fig. 3'whicli is composed ot' the circular plates 3S, 39, and Zl0, and the rods 41, as `already described.

Y By a proper adjustment ofthe nuts 42011 the ends of the rods 41, the protecting arrangement. will also scrveas a means oif straightening the tube 23 when it hasbecome bent or distorted, just as the proper adjustmentotthetension on the spokes or abii cycle will true up the rim.

This protecting' arrangement is quite useful, beca-use dockworkers are often careless and liable to drop things on the thrust screw arrangement, and also totie ropes to it, and in these and other waysbend it.

In this connection, attention is also called to the fact that lthe handle 21 of the device is so disposed thatv when the davit is in its normal inboard position, as indicated in Fig. 1, said handle extends directly over the tube 23 to prevent anything'from falling there.- upon.

Attention is also called to the fact that when the ship goes down by head or stern,

the boats may be pitchedy forwardly or reawardly, and thus rammed against the thrust screw arrangement. Hence the value of the protecting feature which I have provided.

If the rods 11 are made sui'iciciently strong, the threaded connection between the tube 23 and the' cap 24 may be omitted and said rods depended upon entirely to hold the cap 24 in place on said tube 23.

The standard 5 7 of mydevice, being formed' of a single piece of material, gives a very reliable support at the inner end of the device. l e' Y From the foregoing, it will be seen that I have produced a device' of simple, strong, and durable construction, exceptionally well'adapted to the requirements of a davit voft-his character, and one that may yalso be' used with block andy tackle whenever desired, in which latter case, the 'thrust screw arrangement is onlyA usedk to impart to the davit' 'such inward or outward inclination asl will cau-seit .to'rota'te automatically inboard 'or outboard las may bedesired, leavingthe boat to be further manipulated by tbeftackle.V 1 1 Having now described my invention, what I claim as new and desire to protect by Letters Patentisz 1'. The combination Vwith a vessel, of a socket mounted thereon at its lower end to 4rock in a lvertical plane adavit rotatably mountedA .in the socket; :a stationary member on'nth'e vessel; thrust screw mechanism connecting thev upper portion of the socket with the stationary memberl and adapted to rock-the socket past the vertical to impart to thedavitsupported therein a tendency to rotate by-gravityy inthe direction'oi' its. in-

clination and also to raise and lower the davit independently ofthe .rotatabletend-v eney imparted thereto; means on the davit Vat the upper' end oi the socketlfor excluding therein. v f

lll() v 2. The combination with a vessel, .of/av Asocketmounted thereon at its lower end to rock in a vertical plane; a davit rotatably mounted injthe socket; a stationary member on the vessel ;v thrust screw mechanism con-l necting the upper portion ot the socket with the stationary member Aand adapted to rock the socket past the vertical to impart to the davit supported therein atendency to rotate by gravity in the direction of its inclination; and a handle connected .with the ldavit for manually augmenting its tendency to rotate by gravity, said handle' being arranged to normally extend out over said thrust screw mechanism to protect the same.

The combination with a socket pivoted at its lower endfto rock backand forth in a vertical plane, of a stationary member; extensible telescoping `members normally in alinement with each other connecting the stationary member and the socket to rock w the latter back and forth, the diameter of connection; through which the inner telescoping member has longitudinal movement; whereby to permit the telescoping members to be moved out of alinement with each other without binding.

4. The combination with a davit pivoted at its lower end to rock back and forth in-a vertical plane; of a stationary member; eX- tensible telescoping members connecting the davit at a point above its pivoted end with the stationary member to rock the davit on its pivot; and an internal universal joint connecting said telescoping members together to compensate for bending in the outer telescoping member.

5. In a device of the character described, thrust screw mechanism comprising an outer tube with a cap on one end thereof; a ball joint interposed between the cap and the end of the outer tube; said ball having a central threaded opening; a screw rod extending inwardly through the head of the cap and through said threaded opening, said rod being spaced from the inner walls of said outer tube; means for engaging and rotating the screw rod; and means for holding the ball joint against rotation with said bar.

6. The combination with a vessel of a socket mounted thereon at its lower end to rock in a vertical plane; a stationary member on the vessel; a tubular member connected to the socket between its pivot point and its upper end; a threaded'connecting `member inside said tubular member and movable relatively thereto but held against longitudinal movement therein; a. thrust bar rotatably mounted in said fixed member and having threaded engagement with said connecting member to move the same together with the` tubular member back and forth longitudinally; whereby tb rock the socket back and forth..

T. In devices of the character described, means for rocking the ydavit back and forth, comprising extensible telescoping members; plates secured to the outer one of. said members; and spaced adjusting bars carried by said plates for straightening bends in said outer member.

8. ln a device of the character describec; means for rocking the davit back and forth, comprising extensible telescoping members connected with the davit at one end; and at its other end having a. fixed member secured to the ship; a universal joint connection outside the telescoping parts for connection with said stationary part; and another universal joint connection inside the telescoping parts for connecting said parts to each other. 9. In a device of the character described, means for rocking the davit back and forth, comprising extensible telescoping members and a member fixed to the ship, said tele.- scoping members being arranged for connection at one end with the davit and at the other end with the fixed member; the inner telescoping member being externally threaded; a round member carried by the outer telescoping member .and having an internally threaded bore for the reception of the inner telescoping member, said round member forming the connecting link between the two telescoping members; and means for holding said round member against rotation with the inner telescoping member.

In testimony whereof I affix my 'signature.

ANE PIETER SCHAT. 

